Pen



FIG. 1 is a front side view of a pen of the present invention.

FIG. 2 is a rear side view of the pen of FIG. 1.

FIG. 3 is a top view of the pen of FIG. 1.

FIG. 4 is a bottom view of the pen of FIG. 1.

FIG. 5 is a left side view of the pen of FIG. 1.

FIG. 6 is a right side view of the pen of FIG. 1.

FIG. 7 is a front left-side perspective view of the pen of FIG. 1; and,

FIG. 8 is a front right-side perspective view of the pen of FIG. 1.

The dashed lines shown in FIGS. 1-8 form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 